<html>
<body>
hello world
<input type="button" onclick="callJS()" value="callJS" /><br>
<input type="button" onclick="callAndroid()" value="调用安卓的方法" /><br>
<input type="button" onclick="jumpActivity()" value="打开安卓的Activity" />
</body>
<script>
function callJS(){
    alert("Android 调用了JS方法")
}
function getCircleArea(r){
   return Math.PI * r * r;
}
function callAndroid(){
   android.hello("lisa");
}
function jumpActivity(){
   jump.jump();
}
</script>
</html>